M365 Custom Graph Connector - missing fields

Question

Hi,

I have successfully created and configured a custom graph connector in M365 admin portal (Home > Search & intelligence > Data sources). My connector provides numerous properties that can be used. However it looks like quite a few fields are not properly stored after indexing. My schema holds 27 properties but not all of them are retrievable.

My following labels are set in the semantic label schema:

• Title (working)
• url (missing)
• Last modified by (working)
• Last modified date time (working)
• File name (missing)
• File extension (missing)
• IconUrl (working)

Some properties should hold data, I am 100% sure that they are returned from my custom connector. Because of the missing properties, search doesnt work properly (no link, cannot filter on filetype).

I am testing the data by using Postman to access my contentsource (https://graph.microsoft.com/beta/search/query). As you can see I am asking for 6 fields but only 2 show up in the results. I know 100% sure that these fields should not be empty. All throughout my data set, these fields (and others) are missing while other (default and custom) fields are properly populated and can be retrieved. I really need some help please!